Pump-actuating mechanism for type-machines.



Patented .Ma '20, |902 ms. BANCROFT. PUMP A-CTUA'TING MECHANISM FOB- TYPE MACHINES,v

-(Applicatidn fil ed Dec, 3, 1901.)

(No Model.)

Nrrnn STATES JOHN SELLERS BANOROFT, or PHILADELP IA,-PENNsYLvANIA,. ssrGNoRs BY MESNE ASSIGNMENTS, TO LANSTON MONOTYPE MACHINETCOMPANY,

or WASHINGTON, DISTRICT OF COLUMBIA, A CORPORATION oFfv'iR,

GINIA.

PUMP-ACTUATlNG MECHANISM FOR'TYPE M'ACHIN EST- Y 7 if SPECIFICATION forming part of Letters ram No. 7oo,29o,- aata"1vr y 2c, 1902.

Application filed December 3, 1901?. Serial No. 84,542. (lll'o'mzjdeld I i To all whmn it may concern:

Be it known that I, JOHN SELLERS BAN-- CROFT, of Philadelphia, in the county of Phil adelphia, State of Pennsylvania, have in vent- 5 ed certain new and'use'ful Improvements in Pump-Actuating Mechanism for Type-Machines and I hereby declare the following .to be a full, clear, andexactdescription of the same, reference being had-to the accompany- IO ing drawings, forming a part of this specifiserving the adjustment of its actuating de-- vices by eliminating or neutralizing certain disturbing elements incident to the prior structures.

The organization of the metal injecting devices of the patents. mentioned is such that the pump as a whole reciprocates toward and from the mold, the pump-actuating levers, z 5 theone engaging the piston-rodandthe other the cylinder, following-such movements of the pump for purposes of accommodation, but receiving independentmotion for operating the pump when thelatter is in commu- 'nication with the mold. The twomotions-- those of the pump and 'of the'actuatirig-levers-being performed about different centers result in a sliding motion of the points of contact between the actuating-levers. and 3 5 their bearings upon the cylinder and piston, respectively, which, taken-in connection with the application of the relatively high degree of power transmitted in ejectingthe metal,

causes a rapid wearing or battering of the 40 surfaces in contact; This not-only interferes with the ready withdrawal of the actuating levers, as when the melting-pot is swung clear of the mold, but it aISO-deranges the adjust ments necessary for effeotiveaction. Moreover, a strong tendency is developed to force the piston laterally in its cylinder, causing it to bind therein, resulting in a rapid wear of the cylinder or plunger, or both, and otherwise seriously interfere with the proper per- ;formance of its functions. To overcome these 5o defects is the p urpo'seof thepresentimprove T ments, which latterinclude the application I "ofgu-ides to the pump-cylinder, said, guides cooperating with thefupper portion of the piston-rod to resist lateraldispla'cement' under p the action of the actuating 1evers,'and the interposition of shoe'sorfslides between the engaging end of the=actuating-levers-and their bearingson the piston 'rodand' cylinder,

respectively, said shoes or slides .being'pivot. 6o: ally attached to the leversand movable in guides/on the pump, so as: to furnish-wide bearing-surfaces over which the blow or percussive action is distributed, thereby avoid ing the battering andtdestruction of-said bearing-surfaces and preservingth'e parts in their adjusted position. v

The preferred form of embodiment will first be explained in connection with the'accom-j panying drawings,'after'which the novel feet- 570 tures will be pointed out in'the claims. v Figure l is a perspective view'of a portion" of the previously-patented pump mechanism, showing the improvements as applied thereto. Fig. 2 is g a transverse vertical section through the engaging ends of theactuatinglovers, the piston-rod being shown in eleva- 'tion. tion, of the connection-- between the actuat-' .ing-levers and pump. gFig. .t'is'a perspective Fig. 3 is a side elevation,- partly in sec-- I View of one of the shoes looking toward the inner face thereof. 7

Similar numerals indicate like'parts in the several figures. 1

For purposes of. illustration a'nd description only such portions of the patented fluidmetal-injecting devices-necessary to an un-- derstandingof the "invention are shown. These include; the melting-pot-l, the upper end of the pump-cylinder 2,"-the lever' 3, engaging flange 4: on the pump-cylinder forreciprocating thelatter relatively-tothe mold, the piston-rod 5, and the connected actuating-levers 6 7, of.which the upper one,i '6, fhas its engaging end lying betweenjcollars 8-.9Lon 5 the piston-rod, while the lower one,7,'projeots begween collars or bearings 10 11 on the cyl 1n er.

As heretofore constructed the rounded ends of the actuating-levers 6 7 were fitted between and directly engaged the opposing faces of their respective collars 8 9 and 10 11, with the result that under the violent action of said lever the surfaces soon became battered and worn to such an extent as to materially interfere with the proper delivery of metal. Not only did it affect the various adjustments through which the action of the pump is controlled and regulated, but the destructive action increased progressively as the bearing-surfaces became worn away, hesides which there was developed an increased tendencyof the plunger to bind and ent,owing to the lateral displacement of its piston-rod. To remedy this,each lever 6 7 has the branches of its furcated engaging end formed or provided with semicylindrical bearings 12 and a central aperture 13 for the reception of a block or slide 14, the latter formed or provided with a semicylindrical recess 15 in one side and a central bearing 16. The upper and lower faces of blocks 14 are parallel, and each block is fittedto work easily between its collars or guides 8 9 or 10 11, accordingly as it cooperates with the piston-rod or the cylinder. The forward end ofeach block is slightly beveled to facilitate entrance between the collars and is further provided with an elongated opening 17 for the accommodation of a pin 18 or equivalent holding device carried by the lever. By these means the wear resulting from the difference in motion between the actuating-levers and the members of the pump instead of being concentrated is distributed over the relatively larger contact-surfaces 12 13 15 16, the opposite faces of blocks 14:, and the collars 8 9 or 10 11 and this without in any manner interfering with the normal operation of the pump mechanism, including the withdrawal and insertion of the actuating-levers to release or engage the piston-rod. To further guard against the binding of the piston, there is erected upon the upper portion of the pump-cylinder two vertical guides or bars 20, of which the inner one stands between the furcated end of lever 6. Upon the piston-rod 5 are formed or applied parallel surfaces 21, fitted to work vertically between guides 20. These guides stand in the plane of oscillation of the actuating-lever and resist lateral motion which might otherwise be communicated to the piston-rod through said actuating-lever, and they do not interfere with the withdrawal of the piston-rod either from the cylinder or from its actuating-lever.

Having thus described my invention, What I claim as new, and desire to secure by Letters Patent, is-

1. In a metal-injecting mechanism such as described, the combination with the pumpcylinder and piston-rod, each provided with collars or shoulders, of the actuating-levers and the slides pivotally attached to said levers and engaging the collars on the pumpcylinder and piston-rod respectively substantially as described.

2. In a metal-injecting mechanism such as described, the combination with the cylinder and piston-rod and the connected furcated actuating-levers of the shoes fitted to transverse guides on the cylinder and piston-rod, respectively, and each provided with a semicylindrical recess and central pin engaging a semicylindrical bearing and central recess on one branch of each actuating-lever; substantially as described.

3. In a metal-injecting mechanism such as described, the combination with the cylinder, pistoirrod and actuating-levers therefor, of the guides applied to the cylinder and engaging the piston-rod to resist lateral motion, substantially as described.

4. In a metal-injecting mechanism, such as described, the combination with the pistonrod and cylinder of the pump and the connected actuating-levers whose furcated engaging ends embrace the cylinder and pistonrod, respectively, and engage opposite collars thereon, of guides carried by the cylinder in the plane of movement of the furcated engaging ends of the levers, said guides engaging the piston-rod on opposite sides thereof beyond the cylinder; substantially as described.

JOHN SELLERS BANCROFT.

Vitnesses:

FRANK G. GRIER, E. R. HARPER. 

